US 2021/0344271 A1 · ERROR AMPLIFIER WITH ACCURATE OUTPUT CLAMP FUNCTION

Abstract

This present invention is an invented high-performance error amplifier concept and unique circuitry architecture for controller of switching mode power supply (SMPS). The invented error amplifier comprises a front-end buffer circuit, an embedded differential amplifier, an N-MOSFET based output driving stage and coupled passive RC network. The embedded error amplifier is constructed with two differential pair inputs and an output amplification stage. N-MOSFET output stage coupled to the output of the embedded differential amplifier enhances the load driving capability of proposed error amplifier. The clamp voltage can be configured by another passive network and an output stage with two current sources. This invention allows user to arbitrarily configure the clamp voltage level regardless of the error amplifier's bias voltage. In addition, the highly accurate clamp voltage level can be achieved without temperature drift issue.

Claims11

Dependent claims

A voltage regulator system, comprising:

a main circuit to draw power from its input terminal - Vin to produce a desired output voltage following commands from control circuit, wherein main circuit is coupled to a gate driver of a VR controller and provides power to load;
a control circuit to provide pulse width modulation (PWM) signal and MOSFET driving for the main circuit, wherein control circuit can be implemented as an independent component or integrated as part of the power device;
and
a gate driver coupled between the main circuit and the control circuit to complete a feedback process, wherein the Gate driver may be embedded in either the VR controller or integrated as part of the main circuit.

1 more element

Dependencies are inferred from the claim text.

Error amplifier with accurate output clamp function

Life of this patent

Error amplifier with accurate output clamp function

Life of this patent

Abstract

Claims11